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Two million people who have the glaucoma don't know they have it. Glaucoma is a group of eye diseases that can damage the eye's optic nerve and result in vision loss and blindness. African Americans over 40 years old, everyone over 60, and people with a family history of glaucoma are more likely to get the disease.

It can usually be controlled with medicine or surgery. It's important to visit your eye care professional and get a dilated eye exam every one to two years. Take a quiz to find out how much you know about glaucoma and learn more about eye diseases.